GuardsDOM Guards

Check FileList

Checks if a value is a FileList instance.

isFileList

Checks if a value is a FileList instance.

isFileList(value: unknown): value is FileList

const fileInput = document.querySelector('input[type="file"]');
isFileList(fileInput.files); // true

Last updated: Tue, May 26, 2026 04:14:18PM (UTC)

Check File or Blob

Checks if a given value is an instance of File or Blob.

Check File Array

Checks if a value is an array of native File objects.